Weenect Silber WE401 Replacement Battery 3.7V 1000mAh

Weenect Silber WE401 — 3.7V Li-Polymer Replacement Battery (AHB523450)

This 3.7V 1000mAh lithium-polymer cell replaces the original AHB523450 battery in the Weenect Silber WE401 GPS tracker. The Silber WE401 is a personal GPS tracking device — typically used for monitoring elderly or vulnerable individuals in real time. When the original cell degrades, charge cycles shorten noticeably before the device starts losing signal mid-track.

• Silber WE401 fit: The WE401 runs a single-cell Li-Polymer architecture at 3.7V nominal. This cell matches that voltage rail and the AHB523450 footprint — 51.20 × 33.70 × 5.00mm — so the BMS handshake completes without fault codes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the WE401 platform. The BMS accepted the cell without entering protection mode, and the tracker returned to active tracking state as expected after each cycle.
• Cold-start satellite acquisition after swap: After fitting this cell, power the device fully on outdoors before first use. GPS trackers perform a cold start after any full power interruption — first satellite fix can take 5–10 minutes outdoors. Subsequent power cycles reacquire much faster once almanac data is cached.

Why the WE401 shuts off without warning before the battery indicator hits zero

The WE401's fuel gauge is calibrated to the original cell's discharge curve. A degraded or replacement cell may have a slightly different voltage-drop profile under load. When the GPS receiver and cellular modem draw current simultaneously, voltage sags below the BMS cutoff threshold faster than the indicator tracks. The visual warning never fires because the cutoff trips first. To recalibrate, run two full charge-to-cutoff cycles so the firmware maps the new cell's discharge curve accurately.

WE401 draining noticeably faster during active location updates than in standby

In standby, the WE401 pings location at longer intervals — the GPS receiver powers down between fixes. In active tracking mode, the receiver stays on continuously alongside the cellular radio transmitting updates. That combined load draws significantly more current than standby polling. If drain seems excessive even in standby, check the app's update frequency setting — reducing the ping interval from 30 seconds to 2 minutes drops the active-radio duty cycle substantially and extends time between charges.